Texas Democrat Al Green introduced two articles of impeachment against President Donald Trump in the House earlier today, and while 364 representatives voted to kill the resolution, 58 Democrats voted to proceed.

House minority leader Nancy Pelosi has advised Democrats to exercise caution and wait until sufficient evidence that Trump committed an impeachable offense turns up. Green hasn’t listened, though, and his aggressive support for impeachment might cause problems for Democrats in 2018. Voting prematurely forces Democrats facing re-election in tough districts to go on the record about their desire to impeach Trump, leaving them with a sort of Catch-22: If they vote to kill the resolution, they risk alienating the blue half of their voters; if they vote to proceed, they risk alienating the other half.

All in all, it was a politically inept decision on Green’s part. If Pelosi and the House minority leadership want to keep impeachment hopes alive, they need to rein him in.